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HALL-A STATUS REPORT

HALL-A STATUS REPORT. Hall A Collaboration Meeting June 10-11, 2010 K EES DE J AGER J EFFERSON L ABORATORY. Publications (incl. submissions) in 2010.

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HALL-A STATUS REPORT

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  1. HALL-A STATUS REPORT Hall A Collaboration Meeting June 10-11, 2010 KEESDE JAGER JEFFERSON LABORATORY

  2. Publications (incl. submissions) in 2010 • A. Shahinyan et al., The Electromagnetic calorimeter in JLab Real Compton Scattering Experiment, resubmitted to NIMA, arXiv:0704.1830 • J. Glister et al., Proton Polarimeter Calibration between 82 MeV and 217 MeV, NIMA A606, 578 (2009) • I. Pomerantz et al., Hard Photodisintegration of a Proton Pair, PLB 684, 106 (2010), 0908.2968 [nucl-ex] • M. Coman et al., Cross Sections and Rosenbluth Separations in 1H(e,e’K+) Λ up to 2.35 GeV2, PRC 81, 052201 (2010), 0911.3943 [nucl-ex] • M. Paolone et al., Polarization Transfer in the 4He(e,e'p)3H Reaction at Q2 = 0.8 and 1.3 GeV2, submitted to PRL, 1002.2188 [nucl-ex] • J. Glister et al., Polarization Observables in Deuteron Photodisintegration below 360 MeV, submitted to PRL, 1003.1944 [nucl-ex] • Two papers in collaboration review • Total number of Hall A publications: Science 1, PRL+PLB 42(+2), PRC 19, NIM 18(+1) • Hall A has been running now for 11 years, with an average publication output of 5+ • However, CLAS publishes 10-12 papers annually!!!! • Top cited Hall A publications: 1 500+, 3 250+, 4 100+, 17 50+

  3. PUBLICATIONS-II • Archival papers promised to be completed LAST year: • E89-044 3He(e,e’p) complete L/T separation • E91-026 deuteron A and B next spring • E94-010 GDH only introduction needed • E99-007 GEp-II • E99-114 WACS • E01-001 Super-Rosenbluth • E94-107 Hypernuclear • E99-115 HAPPEX-II • PLEASE COMPLETE THESE PUBLICATIONS ASAP!!

  4. PUBLICATIONS-III • Standard publications in draft form for too long: • E97-111 4He(e,e’p) • E99-115 Transverse SSA • E97-110 SAGDH (coming out soon, I have been promised!) • E01-020 Deuteron Electrodisintegration (this summer?) • Circulating, soon to be submitted (!?) • E02-013 GEn • E08-007 GEp at low Q2 • E05-004 A(Q) at low Q2 • E04-018 Elastic Scattering off 3,4He • E00-102 16O(e,e’p) • E06-007 208Pb(e,e’p) PLEASE COMPLETE THESE PUBLICATIONS ASAP!! THE CC IS SENDING OUT MONTHLY REMINDERS

  5. Lead Parity Experiment PREX • Installation completed two weeks late • Problems with • Helicity-flip gating (resolved) • Setting raster too large for optics target (resolved) • Raster synching to compensate for target inhomogeneities (resolved) • Radiation damage to electronics (ongoing) • Radiation and heat damage to O-rings (ongoing) • Heroic effort from Hall A technical staff and from PREX collaboration, but outcome still uncertain • Run extended to June 21, followed by a brief run for APEX tests • WARNING: • Summer down shifted by three weeks

  6. Scheduled Experiments in Hall A ExpTitleContact persons June/Sep DVCS Installation (enlarged PbF2 calorimeter) Sep/Dec E07-007 p-DVCS Carlos Munoz Camacho E08-025 n-DVCS MalekMazouz • Preparations for DVCS installation well underway • During the six-month accelerator down in 2011 Hall A is scheduled for a major installation in preparation for two A-rated experiments E08-027 (g2p) and E08-007 (GEp/GMp at very low Q2). The Hall C SC magnet for the polarized target has been repaired at Oxford, but full funding for those two experiments is still in jeopardy.

  7. Hall A Schedule (Tentative!)‏ Open issue: Summer down has been shifted by three weeks, but FY11 six-month down will remain in place, effectively shortening the FY11 schedule by three weeks

  8. PAC36 • PAC36 (August 23-25) will only provide a grade and beam time allocation for proposals in two science categories, approved in previous PACs: • The Hadron spectra as probes of QCD (GluEx and heavy baryon and meson spectroscopy) • The longitudinal structure of the hadrons (Unpolarized and polarized parton distribution functions) • Conditionally approved experiments in these categories need to be resubmitted (and presented) and approved before being considered • On June 3 a Safety Review chaired by Rolf Ent judged the Conceptual Design of a tritium target to be valid enough for the F2(d/u) proposal to be submitted to PAC36.

  9. Hall A Approved Experiments at 12 GeV

  10. Hall A Conditionally Approved 12 GeV Experiments

  11. 12 GeV • Three large experimental projects in preparation for Hall A • SuperBigbite: • Funding has now been included in the JLab out-year budget request • Second technical review at JLab very supportive, to be followed by mail review this summer • MOLLER: • Fully approved by PAC34 • Director’s review on January 14/15 at JLab highly successful • Waiting for CD-0 • SoLID: • Technical conceptual design completed by ANL • Fully approved at PAC35 (as well as SIDIS with SoLID) • Waiting for Mont to organize Director’s Review

  12. Summary • The research program in Hall A is highly successful, and has a bright future, both for the remainder of the 6 GeV program and for that with the upgrade • There are approved proposals that will take close to 10 years to complete (if one includes installation time): • ~1 year with the HRS pair • ~1.5 years with SuperBigbite • ~2.5 years with MOLLER • ~3.5 years with SoLID, including SIDIS • Clearly, it will take a very strong collaboration effort to accomplish this • However, always keep in mind that the publication of our results is a necessary requirement for crowning our cap.

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